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Insights into Planetary and Binary Statistics from Generation-II OGLE-MOA Microlensing Surveys

This study presents the findings of the Generation-II OGLE-MOA microlensing survey conducted from 2011 to 2013. Collaborating with institutions like Tel-Aviv University, the research focuses on detecting planetary systems and analyzing their frequency. Using controlled experiments and continuous data from various telescopes, the study aims to reveal the occurrence of snowline-related giant planets and other planetary types. Results suggest that at least 17% of stars host planetary systems, with notable findings of super-Jupiters around low-mass stars. Future work may leverage new telescopes for advanced surveys.

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Insights into Planetary and Binary Statistics from Generation-II OGLE-MOA Microlensing Surveys

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  1. Microlensing Planetary and Binary Statistics from 2011-2013 Generation-II OGLE-MOA-WiseYossiShvartzvaldTel-Aviv University with Dan Maoz, MatanFriedmann (TAU) in collaboration with OGLE, MOA, µFUN

  2. Microlensing statistics – snowline planet frequency Gould et al. 2010 (6 planets): ~1/3 of stars have snowline-region giant planets ~1/6 of stars have solar-like planetary systems Sumi et al. 2010 (10 planets): Neptunes are at least 3 times more common than Jupiters Cassan et al. 2012 (3 planets+Gould10+Sumi10): ~1/6 host Jupiters ~1/2 host Neptunes ~2/3 host super-Earths

  3. Second generation survey • A different approach: • Controlled experiment: • Untargeted survey, specific field (high mag + low mag) • Continuous coverage • Forward modeling for planet abundance: • Simulate the experiment • Define planetary anomaly detection threshold (not necessarily perfectly modeled events) • Compare data to simulation

  4. The generation-II network Wise Obs., Israel, 1m OGLE, Chile, 1.3m MOA, NZ, 1.8m

  5. The generation-II network

  6. Second generation microlensing survey • 8 deg2 of bulge with highest lensing rate • covered quasi-continuously by all 3 telescopes • cadences 20-40 min

  7. Simulating the experiment What to expect from Generation II? a simulation: Monte-Carlo of many Solar-System-like planetary systems, host star properties matching those of bulge microlensing population, random inclinations. Shvartzvald & Maoz 2012

  8. Simulating the experiment …add real sampling sequences, photometry errors… Ray trace through systems…… …search for planetary-type anomalies with same detection criteria as real data

  9. Simulating the experiment Simulation results: can detect ~15-20% of planets around microlensed stars; Shvartzvald & Maoz 2012

  10. 2011-2013 sample • Sample Criteria: • u0<=1 • t0 within Wise season • Data from all 3 groups

  11. 2011-2013 sample • Sample Criteria: • u0<=1 • t0 within Wise season • Data from all 3 groups

  12. Comparison to simulation -u0 2011-2013 sample Simulation Shvartzvald & Maoz 2012

  13. Comparison to simulation -tE 2011-2013 sample Simulation Shvartzvald & Maoz 2012

  14. tE distribution 2011-2013 sample MOA-II 2006-2007 Sumi et al. 2011

  15. Anomalous events Mass ratio

  16. Anomalous events Mass ratio Accounting for detection efficiency, >17% planetary system frequency

  17. Gen-II planets From the 16thmicrolensing conference in Pasadena ???

  18. Gen-II planets • MOA-11-322 Shvartzvaldet al. 2014

  19. Gen-II planets • MOA-11-322 Super-Jupiter around M dwarf Shvartzvaldet al. 2014

  20. Gen-II planets I-band (mag) OGLE MOA Wise • MOA-11-322 • MOA-11-293 Survey data only: All data: I-band (mag) Yee et al. 2012 HJD-2450000

  21. Gen-II planets I-band (mag) OGLE MOA Wise • MOA-11-322 • MOA-11-293 Survey data only: All data: First ML planet in the habitable zone I-band (mag) Batista et al. 2013 Yee et al. 2012 HJD-2450000

  22. Gen-II planets • MOA-11-322 • MOA-11-293 • OGLE-11-265 Saturn around M dwarf modeled by C. Han

  23. Gen-II planets • MOA-11-322 • MOA-11-293 • OGLE-11-265 • OGLE-12-406 Super-Jupiter around M dwarf Poleski et al. 2013, Tsapras et al. 2013

  24. Gen-II planets • MOA-11-322 • MOA-11-293 • OGLE-11-265 • OGLE-12-406 Super-Jupiters around low-mass stars are common? Super-Jupiter around M dwarf Poleski et al. 2013, Tsapras et al. 2013

  25. Future Work

  26. Galactic model from higher order statistics

  27. C28 telescope • A new telescope at Wise observatory: • 0.71m telescope • Fully robotic • FOV: 1 degree2 • Together with 1m telescope, • higher cadence / more fields

  28. Conclusions • 2nd generation microlening survey: • Preliminary results suggest a lower limit of 17% planetary systems frequency • Super-Jupiters around low-mass stars are common (?) • Multiplicity fraction and binary mass ratio distributions

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